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Salt tolerance in Aster tripolium L. II. Ionic regulation.

C Shennan1, R Hunt1, E A C Macrobbie1

  • 1Botany School, Downing Street, Cambridge CB2 3EA, U.K.

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|July 11, 2017
PubMed
Summary

This study shows that Aster tripolium, a halophyte, maintains stable shoot ion concentrations under varying salinity by accumulating inorganic ions. Sodium largely replaces potassium in shoots as salinity rises, influencing plant growth and osmotic adjustment.

Keywords:
Aster tripoliumAsteraceaechlorideion regulationosmotic adjustmentpotassiumsalinitysea astersodium

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Area of Science:

  • Plant Physiology
  • Environmental Science
  • Biochemistry

Background:

  • Halophytes like Aster tripolium L. are crucial for understanding plant adaptation to saline environments.
  • Salinity stress significantly impacts plant ion homeostasis and growth.
  • Inorganic ion accumulation is a key mechanism for osmotic adjustment in halophytes.

Purpose of the Study:

  • To investigate the ion content dynamics (Na, K, Cl) in Aster tripolium under different salinity levels.
  • To elucidate the relationship between salinity, ion transport, and osmotic adjustment in this halophyte.
  • To analyze how Aster tripolium maintains ion balance and growth under salt stress.

Main Methods:

  • Plants of Aster tripolium L. were grown at various salinities for 36 days.
  • Tissue ion contents (Na, K, Cl) were measured at frequent intervals.
  • Shoot and root ion concentrations, fresh weight: dry weight ratios, and osmotic potential were analyzed.

Main Results:

  • Aster tripolium exhibited high inorganic ion accumulation, characteristic of halophytes.
  • Increasing salinity led to Na replacing K in shoots, while root K remained stable up to 500 mol m⁻³ NaCl.
  • Shoot (Na + K) concentration on a water basis was constant, despite fluctuations on a dry weight basis, linked to changes in the fresh weight: dry weight ratio.
  • Chloride was a major anion in shoots, and (Na + K) salts contributed significantly to shoot sap osmotic potential.

Conclusions:

  • Aster tripolium effectively regulates ion transport and accumulation to maintain osmotic balance under salinity stress.
  • The observed ion dynamics support the role of inorganic ions in halophyte survival and growth in saline conditions.
  • Understanding these mechanisms is vital for plant science and agriculture in salt-affected regions.